Answer:
Option B. In Sense and Sensibility, after Sir John Middleton lets it slip that Elinor and Edward have some affectionate feelings for each other, Lucy corners Elinor and tells her of her secret engagement to Edward.
Step-by-step explanation:
In the novel written by author Jane Austen, after Sir John Middleton lets it slip that Elinor and Edward have some affectionate feelings for each other, Lucy when being left alone with Elinor asks her if she knows Edward's mother, and after that tells her that she has been secretly engaged to Edward for four years and that they have been forced to keep the status of their relationship as a secret due to the fact that Lucy has no fortune.